Tagged Questions
10
votes
3answers
252 views
Purpose of outer key in HMAC
From what I know, the HMAC constructions has two strength:
It's resistant to length extensions
Since the key is consumed before the message, the attacker does not know the initial state, preventing ...
6
votes
1answer
543 views
In which situations is a length-extension attack a problem?
A lot of hash functions, including the SHA-2 family(but not the SHA-3 candidates and SHA256d) are vulnerable to length extension attacks. But when is this property a problem?
I guess certain naive ...
